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| number = ML070670331
| number = ML070670331
| issue date = 03/01/2007
| issue date = 03/01/2007
| title = Harris Site Status, NuStart-NEI Seismic Workshop
| title = Site Status, NuStart-NEI Seismic Workshop
| author name =  
| author name =  
| author affiliation = Progress Energy Carolinas, Inc
| author affiliation = Progress Energy Carolinas, Inc
Line 16: Line 16:


=Text=
=Text=
{{#Wiki_filter:1 Progress Energy Harris Site Status NuStart-NEI Seismic Workshop March 1, 2007 2 Harris Project Summary*Existing Harris Nuclear Plant (HNP Unit 1) located 20 miles SW of Raleigh, NC*Two new AP1000 Units (HAR 2 and HAR
{{#Wiki_filter:Progress Energy Harris Site Status NuStart-NEI Seismic Workshop March 1, 2007 1
: 3) are planned adjacent (North) of HNP Unit 1*Site Investigation performed April through December 2006*PSHA and SSE work ongoing*COLA submittal in late 2007 3 Harris Site Location 4 Harris Location of New Units HAR 3 HAR 2 South 5 Harris Geotechnical Boring Layout SiteView NI 6 Harris Geotechnical Investigation Summary 4 Pairs of Profiles (depth < 100 ft)
SASW Surveys (Vs) 5 Profiles (depth < 70 ft)
MASW Surveys (Vs) 2 Boreholes (~200 ft depth)
Downhole Logging (Vp and Vs) 7 Boreholes (~150-200 ft depth)
P-S Suspension Logging (Compression and shear wave velocity [Vp and Vs])
~3200 Feet Seismic Refraction Surveys (Vp) 20 Groundwater Monitoring Wells
-50 at AP1000 Structures
-18 General Characterization


-15 at CTs and Conveyance Soil & Rock Borings 7 Harris Existing Subsurface Profile (Typical)
Harris Project Summary
HAR-3 HAR-25 -20'0 -10'0 -10'15 -40'Top of Sound Rock10 -25'Top of Weathered Rock
* Existing Harris Nuclear Plant (HNP Unit 1) located 20 miles SW of Raleigh, NC
-Transition Zone from Residual Soil
* Two new AP1000 Units (HAR 2 and HAR
: 3) are planned adjacent (North) of HNP Unit 1
* Site Investigation performed April through December 2006
* PSHA and SSE work ongoing
* COLA submittal in late 2007                2


to Sound Rock0 -25'Residual Soils-Reddish Brown.
Harris Site Location 3
Typically lean clays (CL), sandy


silts (ML) and silty sand (SM) 8Harris -Unit 2 Fence Diagram with S-Wave Velocity Profiles 9Harris -Unit 3 Fence Diagram with S-Wave Velocity Profiles 10Harris -Unit 2 -S-Wave Velocity Profiles -Adjusted Elevations 11Harris -Unit 3 -S-Wave Velocity Profiles -Adjusted Elevations 12 Harris Rock Shear Wave Velocity*Shear Wave Velocity (V S) below Reactor Island Basemat Elevation (220 feet above MSL) -
Harris Location of New Units HAR 2 HAR 3 South 4


based on 7 suspension logging profiles to depth
Harris Geotechnical Boring Layout SiteView        NI    5


of ~200 feet bgs.
Harris Geotechnical Investigation Summary Soil & Rock Borings                  -50 at AP1000 Structures
Standard Deviation Average Vs (fps)Unit 981 6,079 HAR-3 779 6,227 HAR-2 13 Harris Preliminary Construction Plans
                                    -18 General Characterization
*Plant Site Grades-Establish Plant Grade at Elevation = 260 feet.-Establish Nuclear Island Basemat Subgrade on Competent Rock at Elevation = 220 feet.
                                    -15 at CTs and Conveyance Groundwater Monitoring Wells        20 P-S Suspension Logging (Compression  7 Boreholes (~150-200 ft depth) and shear wave velocity [Vp and Vs])
*Nuclear Island
Downhole Logging (Vp and Vs)        2 Boreholes (~200 ft depth)
: -HAR-2: Rock Excavation (~1H:2V) to basemat subgrade.-HAR-3: Plan to excavate as so il (~2H:1V) to basemat subgrade.
SASW Surveys (Vs)                    4 Pairs of Profiles (depth < 100 ft)
MASW Surveys (Vs)                    5 Profiles (depth < 70 ft)
Seismic Refraction Surveys (Vp)      ~3200 Feet 6
 
Harris Existing Subsurface Profile (Typical)
HAR-2  HAR-3 Residual Soils - Reddish Brown. 0 - 10 0 - 25 Typically lean clays (CL), sandy silts (ML) and silty sand (SM)
Top of Weathered Rock -            0 - 10 10 - 25 Transition Zone from Residual Soil to Sound Rock Top of Sound Rock                  5 - 20 15 - 40 7
 
Harris - Unit 2 Fence Diagram with S-Wave Velocity Profiles 8
 
Harris - Unit 3 Fence Diagram with S-Wave Velocity Profiles 9
 
Harris - Unit 2 - S-Wave Velocity Profiles - Adjusted Elevations 10
 
Harris - Unit 3 - S-Wave Velocity Profiles - Adjusted Elevations 11
 
Harris Rock Shear Wave Velocity
* Shear Wave Velocity (VS) below Reactor Island Basemat Elevation (220 feet above MSL) -
based on 7 suspension logging profiles to depth of ~200 feet bgs.
Unit              Average Vs       Standard (fps)       Deviation HAR-2              6,227            779 HAR-3               6,079            981 12
 
Harris Preliminary Construction Plans
* Plant Site Grades
  - Establish Plant Grade at Elevation = 260 feet.
  - Establish Nuclear Island Basemat Subgrade on Competent Rock at Elevation = 220 feet.
* Nuclear Island:
  - HAR-2: Rock Excavation (~1H:2V) to basemat subgrade.
  - HAR-3: Plan to excavate as soil (~2H:1V) to basemat subgrade.
Overexcavate clay seams at basemat subgrade, backfill/grout with concrete fill.
Overexcavate clay seams at basemat subgrade, backfill/grout with concrete fill.
*Other Structures
* Other Structures:
: -HAR-2: Excavate to Competent Rock and place Engineered Backfill (typically only 5 to 10 feet needed).-HAR-3: Overexcavateand place Structural Backfill (up to 30 feet needed), OR construct deep foundations (caissons). To be  
  - HAR-2: Excavate to Competent Rock and place Engineered Backfill (typically only 5 to 10 feet needed).
  - HAR-3: Overexcavate and place Structural Backfill (up to 30 feet needed), OR construct deep foundations (caissons). To be finalized during detailed design.
13
 
Harris Site Seismicity Giles County Central Virginia
* Site sits in a region of relatively low seismicity
* Sources related to Charleston, East Tennessee, Giles County, and Central Virginia at distances >
Harris Site
                                        ~ 100 km contribute to Charleston            site hazard East Tennessee 14


finalized during detailed design.
Harris Regional Physiographic Setting 15
14 Harris Site Seismicity*Site sits in a region of relatively low seismicity*Sources related to Charleston, East


Tennessee, Giles
Harris Site PSHA
* Use UCSS (Vogtle) update of Charleston seismic source
  - Overlay reoccurring Charleston mb > ~6.5 earthquakes
  - Limit Mmax to mb  6.5 for EPRI-SOG Charleston sources to prevent double counting
* Use EPRI-SOG expert team assessments for all other seismic sources
  - No adjustments in rates needed
  - Minor adjustments in Mmax and source combinations 16


County, and Central
Harris Site PSHA (Contd)
* Use EPRI (2004) Ground Motion Models
* Use EPRI (2006) (G1.3) Aleatory Variability (Sigma)
* Consider use of EPRI (2006) CAV filter (G1.2)
  - Not expected to produce a large change in hazard
  - Implementation will incorporate site response 17


Virginia at distances >
Harris Site Geology
~ 100 km contribute to site hazard Charleston East Tennessee Central VirginiaHarrisSite Giles County 15 Harris Regional Physiographic Setting 16 Harris Site PSHA*Use UCSS (Vogtle) update of Charleston seismic source-Overlay reoccurring Charleston m b> ~6.5 earthquakes-Limit M max to m b6.5 for EPRI-SOG Charleston sources to prevent double counting*Use EPRI-SOG expert team assessments for all other seismic sources-No adjustments in rates needed-Minor adjustments in M max and source combinations 17 Harris Site PSHA (Cont'd)*Use EPRI (2004) Ground Motion Models*Use EPRI (2006) (G1.3) Aleatory Variability (Sigma)*Consider use of EPRI (2006) CAV filter (G1.2)-Not expected to produce a large change in hazard-Implementation will incorporate site response 18 Harris Site Geology*Site sits in Durham subbasinof the Deep
* Site sits in Durham subbasin of the Deep River basin
* Approximately 5,000 ft of Triassic sediments
* Shallow sediments consist of interbedded siltstones and sandstones
* VS 4,000-5000 ft/sec at foundation level, quickly rising to 6,000-7,000 ft/sec 18


River basin*Approximately 5,000 ft of Triassic sediments*Shallow sediments consist of interbedded
Harris Site Response
* Compute amplification of Triassic sediments using NUREG/CR 6728 method 2B
* Shallow velocity profile based on site data to a depth of ~200 ft
* Deeper profile based on nearby deep bore hole and refraction lines 19


siltstones and sandstones
Harris Site SSE Ground Motions
*V S 4,000-5000 ft/sec at foundation level, quickly rising to 6,000-7,000 ft/sec 19 Harris Site Response*Compute amplification of Triassic sediments using NUREG/CR 6728 method 2B*Shallow velocity profile based on site data to a depth of ~200 ft*Deeper profile based on nearby deep bore hole and refraction lines 20 Harris Site SSE Ground Motions*Use performance-based ASCE 43-05 methodology*Define SSE at outcrop of weathered Triassic rocks -elevation ~250 ft*Simultaneously compute motions at foundation level -elevation 220 ft}}
* Use performance-based ASCE 43-05 methodology
* Define SSE at outcrop of weathered Triassic rocks - elevation ~250 ft
* Simultaneously compute motions at foundation level - elevation 220 ft 20}}

Latest revision as of 08:42, 23 November 2019

Site Status, NuStart-NEI Seismic Workshop
ML070670331
Person / Time
Site: Harris, Bellefonte, PROJ0740  Duke Energy icon.png
Issue date: 03/01/2007
From:
Progress Energy Carolinas
To:
Office of Nuclear Reactor Regulation
References
+reviewedjms3
Download: ML070670331 (20)
v • d • e


Text

Progress Energy Harris Site Status NuStart-NEI Seismic Workshop March 1, 2007 1

Harris Project Summary

  • Existing Harris Nuclear Plant (HNP Unit 1) located 20 miles SW of Raleigh, NC
  • Two new AP1000 Units (HAR 2 and HAR
3) are planned adjacent (North) of HNP Unit 1
  • Site Investigation performed April through December 2006
  • COLA submittal in late 2007 2

Harris Site Location 3

Harris Location of New Units HAR 2 HAR 3 South 4

Harris Geotechnical Boring Layout SiteView NI 5

Harris Geotechnical Investigation Summary Soil & Rock Borings -50 at AP1000 Structures

-18 General Characterization

-15 at CTs and Conveyance Groundwater Monitoring Wells 20 P-S Suspension Logging (Compression 7 Boreholes (~150-200 ft depth) and shear wave velocity [Vp and Vs])

Downhole Logging (Vp and Vs) 2 Boreholes (~200 ft depth)

SASW Surveys (Vs) 4 Pairs of Profiles (depth < 100 ft)

MASW Surveys (Vs) 5 Profiles (depth < 70 ft)

Seismic Refraction Surveys (Vp) ~3200 Feet 6

Harris Existing Subsurface Profile (Typical)

HAR-2 HAR-3 Residual Soils - Reddish Brown. 0 - 10 0 - 25 Typically lean clays (CL), sandy silts (ML) and silty sand (SM)

Top of Weathered Rock - 0 - 10 10 - 25 Transition Zone from Residual Soil to Sound Rock Top of Sound Rock 5 - 20 15 - 40 7

Harris - Unit 2 Fence Diagram with S-Wave Velocity Profiles 8

Harris - Unit 3 Fence Diagram with S-Wave Velocity Profiles 9

Harris - Unit 2 - S-Wave Velocity Profiles - Adjusted Elevations 10

Harris - Unit 3 - S-Wave Velocity Profiles - Adjusted Elevations 11

Harris Rock Shear Wave Velocity

  • Shear Wave Velocity (VS) below Reactor Island Basemat Elevation (220 feet above MSL) -

based on 7 suspension logging profiles to depth of ~200 feet bgs.

Unit Average Vs Standard (fps) Deviation HAR-2 6,227 779 HAR-3 6,079 981 12

Harris Preliminary Construction Plans

  • Plant Site Grades

- Establish Plant Grade at Elevation = 260 feet.

- Establish Nuclear Island Basemat Subgrade on Competent Rock at Elevation = 220 feet.

  • Nuclear Island:

- HAR-2: Rock Excavation (~1H:2V) to basemat subgrade.

- HAR-3: Plan to excavate as soil (~2H:1V) to basemat subgrade.

Overexcavate clay seams at basemat subgrade, backfill/grout with concrete fill.

  • Other Structures:

- HAR-2: Excavate to Competent Rock and place Engineered Backfill (typically only 5 to 10 feet needed).

- HAR-3: Overexcavate and place Structural Backfill (up to 30 feet needed), OR construct deep foundations (caissons). To be finalized during detailed design.

13

Harris Site Seismicity Giles County Central Virginia

  • Site sits in a region of relatively low seismicity
  • Sources related to Charleston, East Tennessee, Giles County, and Central Virginia at distances >

Harris Site

~ 100 km contribute to Charleston site hazard East Tennessee 14

Harris Regional Physiographic Setting 15

Harris Site PSHA

  • Use UCSS (Vogtle) update of Charleston seismic source

- Overlay reoccurring Charleston mb > ~6.5 earthquakes

- Limit Mmax to mb 6.5 for EPRI-SOG Charleston sources to prevent double counting

  • Use EPRI-SOG expert team assessments for all other seismic sources

- No adjustments in rates needed

- Minor adjustments in Mmax and source combinations 16

Harris Site PSHA (Contd)

  • Use EPRI (2004) Ground Motion Models
  • Use EPRI (2006) (G1.3) Aleatory Variability (Sigma)
  • Consider use of EPRI (2006) CAV filter (G1.2)

- Not expected to produce a large change in hazard

- Implementation will incorporate site response 17

Harris Site Geology

  • Site sits in Durham subbasin of the Deep River basin
  • Approximately 5,000 ft of Triassic sediments
  • Shallow sediments consist of interbedded siltstones and sandstones
  • VS 4,000-5000 ft/sec at foundation level, quickly rising to 6,000-7,000 ft/sec 18

Harris Site Response

  • Compute amplification of Triassic sediments using NUREG/CR 6728 method 2B
  • Shallow velocity profile based on site data to a depth of ~200 ft
  • Deeper profile based on nearby deep bore hole and refraction lines 19

Harris Site SSE Ground Motions

  • Define SSE at outcrop of weathered Triassic rocks - elevation ~250 ft
  • Simultaneously compute motions at foundation level - elevation 220 ft 20
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